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CN-121991584-A - Wear-resistant UV (ultraviolet) photo-curing protective coating and preparation process

CN121991584ACN 121991584 ACN121991584 ACN 121991584ACN-121991584-A

Abstract

The invention relates to the technical field of photo-curing materials, and discloses a wear-resistant UV photo-curing protective coating and a preparation process, wherein polyol, isocyanate monomer, chain extender, alkenyl end capping agent and the like are reacted to obtain polyurethane solution; then adding reactive diluents, photoinitiators and the like, stirring and dispersing, spraying on the surface of a substrate, and irradiating light for curing in a UV curing machine to obtain the wear-resistant UV light curing protective coating. According to the invention, the phenyl imide ring is introduced into the polyurethane molecular chain, so that the molecular chain rigidity of polyurethane is improved, the structural strength and structural stability are increased, and the wear resistance, mechanical strength and heat resistance of the coating film are improved.

Inventors

  • XIE WEIXIA
  • LAI YUANQING
  • LAI HAIMING

Assignees

  • 江西蓝海芯科技集团有限公司

Dates

Publication Date
20260508
Application Date
20260209

Claims (10)

  1. 1. The preparation process of the wear-resistant UV light-cured protective coating film is characterized by comprising the following steps of: s1, adding water-removed polyol and isocyanate monomers into a reaction kettle, introducing nitrogen, stirring for prepolymerization reaction, then adding acetone, a chain extender and a catalyst for chain extension reaction, adding an alkenyl end capping agent for end capping reaction to obtain a polyurethane solution; S1, adding an active diluent and a defoaming agent into a polyurethane solution, stirring and dispersing, adding a photoinitiator, stirring and dispersing, spraying the solution on the surface of a substrate, and irradiating light for curing in a UV curing machine to obtain the wear-resistant UV light-curing protective coating.
  2. 2. The process for preparing a wear-resistant UV-curable protective coating film according to claim 1, wherein the proportion of the polyol, the isocyanate monomer, the chain extender and the alkenyl capping agent is 1mol (2.6-3 mol) (1.3-1.5 mol) (0.5-0.6 mol).
  3. 3. The process for producing a wear-resistant UV-photo-curable protective coating film according to claim 2, wherein the polyol is a polyester polyol or a polyether polyol, the polyester polyol comprises poly (1, 4-butylene glycol) adipate diol, and the polyether polyol comprises polytetrahydrofuran ether diol, polyethylene glycol, polypropylene glycol.
  4. 4. The process for producing a wear-resistant UV-photo-curable protective coating film according to claim 2, wherein the isocyanate monomer comprises diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, toluene diisocyanate.
  5. 5. The process for preparing a wear-resistant UV-curable protective coating film according to claim 2, wherein the chain extender comprises diethylene glycol, 1, 4-butanediol, 2-dimethylolpropionic acid, and the catalyst comprises dibutyltin dilaurate.
  6. 6. The process for preparing a wear-resistant UV-curable protective coating film according to claim 1, wherein the temperature at the time of the prepolymerization reaction is 70-80 ℃, the reaction time is 2-3 hours, the temperature at the time of the chain extension reaction is 45-50 ℃, the reaction time is 40-60min, the temperature at the time of the end capping reaction is 45-50 ℃ and the reaction time is 30-40min.
  7. 7. The process for preparing a wear-resistant UV-curable protective coating film according to claim 1, wherein the reactive diluent comprises tripropylene glycol diacrylate, dipropylene glycol diacrylate, trimethylolpropane triacrylate, and the photoinitiator comprises a photoinitiator 1173 or a photoinitiator 184.
  8. 8. The process for producing a wear-resistant UV-photo-curing protective coating film according to claim 1, wherein the UV-curing machine has a power of 1-2kW, a center wavelength of 365nm, an irradiation distance of 10-20cm, and an irradiation curing time of 40-90s.
  9. 9. The process for preparing the wear-resistant UV light-cured protective coating film according to claim 2, wherein the preparation process of the alkenyl end-capping agent is characterized in that toluene, 1mol (0.06-0.07) of phthalylglycine, glycidyl methacrylate and tetrabutylammonium bromide in a proportion of (1.2-1.8) mol are added into a reaction bottle, the mixture is heated to 90-110 ℃, stirred and reacted for 5-8 hours, and the filtrate is distilled under reduced pressure after filtration, and the product is washed and recrystallized to obtain the alkenyl end-capping agent.
  10. 10. A wear resistant UV light-curable protective coating film obtained by the production process according to any one of claims 1 to 9.

Description

Wear-resistant UV (ultraviolet) photo-curing protective coating and preparation process Technical Field The invention relates to the technical field of photo-curing materials, in particular to a wear-resistant UV photo-curing protective coating and a preparation process thereof. Background The UV light curing technology is to make use of ultraviolet irradiation and take place under the action of a photoinitiator, so that the liquid resin is rapidly crosslinked and cured to prepare the solid material, and the UV light curing technology has the advantages of high curing speed, simplicity and convenience in operation and wide application range. The photo-curing resin mainly comprises urethane acrylate, epoxy acrylate and the like. Polyurethane has excellent elasticity, high toughness and excellent adhesive property, has good structural designability, is widely applied, and can be endowed with good UV light curing property by introducing alkenyl at the terminal position of polyurethane. The traditional UV light-cured polyurethane has the advantages of low hardness intensity and poor wear resistance, limits the practical application field of polyurethane, and patent CN112795300B discloses a UV coating and a preparation method thereof, wherein N-alkyl maleimide modified polyurethane acrylic ester, acrylic ester monomer and the like are used as raw materials, and the prepared UV coating has the advantages of low initiator consumption, low smell and the like, but the patent does not solve the problems of poor hardness intensity and wear resistance of the UV light-cured polyurethane. Disclosure of Invention The invention solves the problems of poor hardness, wear resistance and other performances of polyurethane film materials. The technical scheme of the invention is that the preparation process of the wear-resistant UV light-cured protective coating comprises the following steps: (1) Toluene, phthaloyl glycine, glycidyl methacrylate and tetrabutylammonium bromide are added into a reaction bottle, the reaction is carried out, the filtration is carried out after the reaction, the filtrate is distilled under reduced pressure, the petroleum ether is washed, and the product is recrystallized in ethyl acetate, thus obtaining the alkenyl end-capping agent. (2) Adding water-removed polyol and isocyanate monomer into a reaction kettle, introducing nitrogen, stirring for prepolymerization reaction, then adding acetone, a chain extender and a catalyst for chain extension reaction, adding an alkenyl end capping agent for end capping reaction, and obtaining polyurethane solution. (3) And adding an active diluent and a defoaming agent into the polyurethane solution, stirring and dispersing, adding a photoinitiator, stirring and dispersing, spraying the solution on the surface of a substrate, and irradiating light for curing in a UV curing machine to obtain the wear-resistant UV light-curing protective coating. Further, the ratio of phthalylglycine, glycidyl methacrylate and tetrabutylammonium bromide in (1) is (1.2-1.8) mol to (1.06-0.07) mol. Further, the reaction temperature in the step (1) is 90-110 ℃ and the reaction time is 5-8h. Further, the proportion of the polyol, the isocyanate monomer, the chain extender and the alkenyl capping agent in (2) is 1mol (2.6-3 mol) (1.3-1.5 mol) (0.5-0.6 mol). Further, the polyol in (2) is polyester polyol or polyether polyol, the polyester polyol comprises poly adipic acid-1, 4-butanediol ester glycol, and the polyether polyol comprises polytetrahydrofuran ether glycol, polyethylene glycol and polypropylene glycol. Further, the isocyanate monomer in (2) includes diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, toluene diisocyanate. Further, the chain extender in (2) comprises diethylene glycol, 1, 4-butanediol, 2-dimethylolpropionic acid. Further, the catalyst in (2) comprises dibutyltin dilaurate. Further, the temperature in the prepolymerization reaction in (2) is 70-80 ℃ and the reaction time is 2-3h. Further, the temperature of the chain extension reaction in the step (2) is 45-50 ℃ and the reaction time is 40-60min. Further, the temperature of the end capping reaction in the step (2) is 45-50 ℃ and the reaction time is 30-40min. Further, the reactive diluent in (3) comprises tripropylene glycol diacrylate, dipropylene glycol diacrylate, trimethylolpropane triacrylate. Further, the photoinitiator in (3) includes a photoinitiator 1173 or a photoinitiator 184. Further, the power of the UV curing machine in the step (3) is 1-2kW, the central wavelength is 365nm, the irradiation distance is 10-20cm, and the irradiation curing time is 40-90s. The invention has the beneficial technical effects that the alkenyl end-capping agent contains hydroxyl, can react with isocyanate at the end of polyurethane prepolymer, so that alkenyl is introduced at the end position of polyurethane, and the alkenyl is subjected to crosslinking reaction with reactive diluent, and